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Refrigerating and air-conditioning apparatus

  • US 9,222,711 B2
  • Filed: 03/12/2010
  • Issued: 12/29/2015
  • Est. Priority Date: 03/12/2010
  • Status: Active Grant
First Claim
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1. A refrigerating and air-conditioning apparatus comprising:

  • a refrigerant circuit including an outdoor unit, serving as a heat source unit, and an indoor unit, serving as a use side unit, connected by a refrigerant extension pipe;

    a plurality of temperature sensors and a plurality of pressure sensors;

    a control unit having a memory configured to store data, the control unit configured to;

    measure, as operation data, a temperature and a pressure of a refrigerant in a plurality of locations of the refrigerant circuit excluding the refrigerant extension pipe;

    determine if, an operation state indicated by operation data measured by the control unit during normal operation meets an operation data acquisition requirement;

    acquire the operation data as initial learning operation data if the control unit determines the operation state meets the operation data acquisition requirement;

    perform a process of calculating calculation data items including an amount of refrigerant in parts other than the refrigerant extension pipe and a density of refrigerant in the refrigerant extension pipe on the basis of the initial learning operation data;

    calculate the internal volume of the extension pipe on the basis of a group of the calculation data items acquired by the process of calculating;

    calculate a standard refrigerant amount, serving as a criterion for determining whether the refrigerant is leaked from the refrigerant circuit, on the basis of the calculated refrigerant extension pipe internal volume and the initial learning operation data;

    store the refrigerant extension pipe internal volume and the standard refrigerant amount in the memory; and

    calculate a total amount of refrigerant in the refrigerant circuit on the basis of the refrigerant extension pipe internal volume stored in the memory and operation data measured by the control unit during normal operation, and compare the calculated total refrigerant amount with the standard refrigerant amount stored in the memory to determine whether the refrigerant is leaked.

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